Expansion joint



March 19, 1929. A. c. FISCHER EXPANS I ON JOINT Filed Aug. 2l, 1926 more or less inefficient.

Patented Mar. 19, 1929.

UNITED STATES PATENT OFFICE.

ALBERT C. FISCHER, 0F CHICAGO, ILLINOIS, ASSIGNOR TO THE PHILIP CAREY MANU- FACTURING COMPANY, A CORFORATION 0F OHIO.

EXPANSION JOINT.

Application led August 21. 1926. Serial No. 130,685.

This invention relates to preformed expansion joint materialand has particular reference to a preformed strip suitable for this purpose, which, owing to its peculiar construction and functioning effect acts in the capacity of a self-healing joint, so to speak.

Very often in expansion joint installatlon ditiiculties are experienced in affecting a bond between the sides of the expansion joint andI the confronting ends of the concrete sections between which the joint is installed, with the result that contraction of the sections lea-ves spaces which become filled with refuse from the surface of the roadway, rain-v water seeps in, and the The purpose of my present invention is to provide means `for not only affecting a bond between the jointand the sections, but to also provide means for supplying a goodly quantity of mastic adhesive to the sides of the joint at all times, so that the same lmay act in the capacity of a filling medium, so that in the event spaces should occur between the joint and lthe sections, dueto extreme contraction, there will always be suiiicient mastic present to fill the spaces and thus keep the joint properly filled and waterproofed at all times.

The preferred means for realizing the above results is illustrated in the accompanying drawing, in which Figure 1 is a perspective view of a portion of a preformed stri of expansion joint material, showing perfbra'tions which accommodate the mastic adhesive. The perforations in this figure being unfilled.

' Figure 2 is a similar view showing perforations filled with the mastic adhesive.

Figure 3 is a cross section of the unfilled 'oint as shown in Fi ure 1.

Figure 4 is a perspective view of a jointconstructed in accordance with the form shown in Figure l, but having a crown applied thereto. Figure 5 is a cross section of a joint constructed in accordance with the form shown in Figure l, showing the perforations filled and with mastic applied to the sides.

Referring now to the drawing in detail. 5 represents a preformed strip made from any material suitable forthe purpose, such, for instance, as a composition of bituminous material with fibrous material incorporated joint then becomes therein, or else it may be simply a matted mass of fibrous material. In other words, the fibrous mat-like structure may be waterproofed or unwaterproofed, according to requirements.

lRegardless of the material entering into the construction ofthe strip it will comprise a preformed structure with a multiplicity of perforations in the thickness thereof. These perforations serve as separate cartridges, so

`the suction thus created will pull the mastic out of the per'forations, and if the same is of the right fluidity it will iiow into any crevices that may be present, as will hereinafter follow.

When the mastic has been pulled out of the perforations, due to contraction of the sections,'and the resultant suction therefrom, and upon expansion of the sections the mastic on the sides of the joint will be `forced into any crevice that might be present.

f A joint constructed as above explained is practically a self-healing joint in that it contains a sufficient quantity o mastic adhesive in the interior structure of the joint which is only used when the same is pulled out or pressed out of the perforations. With this condition present there need not be an objectionable amount of free mastic on the sides of the joint which will ooze out of the top of the joint on expansion of the sections. Even if it is present on the outside of the joint when the sections expand, instead of being forced out of the top of the joint the excess of the mastic will be forced back into v may be extruded from the perforations upon expansion of the sections, providing the eX- pansion is severe enough to produce the pressure required to squeeze it out. If the pressure thus produced is not severe it will simply force the mastic back into. the perforations without extruding the same. The same principle applies to -the result upon contraction of' the joint. If the pull is severe the mastic will be pulled out of the perforations, but if itis simply a nominal degree ofl contraction the pull as a result Will not go any further than affecting y the mastic on the sides of the joint.

As a modification I might even coat the sides ofthe joint with the same kind of mastic adhesive as indicated at 7 in Figure 5, the perforations thus being filled as at 8, the same as shown in Figure 2.

As a modified form I may decide to use a crown for the joint, as at 9 (see Figure 4). This crown being a more or less mastic composition, such, for instance, as oxidized asphalt with fibrous filling material. The crown in this respect would be very soft so that it would mushroom readily and seal the crown of the joint in combination with the mastic on the sides of the joint as a result of filling the perforations. The mastic'adhesive may be a composition comprisingbituminous material yWith-a fiow, retarder incorporated therein, such as, finely divided fibrous material, or else a composition suitable for the purpose may be developed by the further addition of rubber latexl or dissolved rubber. A good material suitable for the purpose would be agrade of asphalt fiux of the desired fluidity, the idea being that it should notbe thin enough to run but at the.

same time it should respond to pressure so as to sluggishly flow in response to pressure.

I claim:

1. An expansion joint, comprising a preformed perforated strip, of a thickness to. provide a complete joint, the perforations in said strip being filled with a mastic of sufficient fluidity to flow in response to changes in dimension of the space in which the joint is installed.

2. An expansion joint, comprising a preformed strip of a thickness to provide a coniplete joint and having sockets formed therein, the sockets in said strip being filled with adhesive mastic o sufficient fluidity to flow in response to chan es in dimension of the space in which the joint is installed.

3. An expansion joint, comprising a, preformed perforated strip'of matted fibrous material, and of a thickness to provide a complete joint, the perforations in said strip being filled with mastic adhesive material of sufficient fluidity to flow in response to changes indimension of the space in which the joint is installed. 1

4. A11 expansion joint constructed of a single .strip of compressible material of a thickness to provide a complete joint, said strip having perforations therein, and said perforations being filled with a mastic.

5. An expansion joint constructed of a single strip of compressible material of a thickness to provide a complete joint, said strip having perforations therein, and said per-' forations being filled with a mastic, and a soft plastic crown along the edge of said strip.

ALBERT C. FISCHER. 

